Electric transformer arrangement



Sept. 11, 1923.

F. E. BERRY ELECTRI C TRANSFORMER ARRANGEMENT Filed Jan.

20. 1921 2 Sheets-Sheet 1 Sept. 11, 1923.

F. E. BERRY ELECTRIC TRANSFORMER ARRANGEMENT Filed Jan. 20 1921 2 Sheets-Shoot 2 Patented Sept. 11, 1923.

UNITED STATES PATENT OFFICE.

FREDERICK EDMUND BERRY, or HAYES, ENGLAND.

ELECTRIC TRANSFORMER ARRANGEMENT.

Application filed January 20, 1921.

To all whom it may concern:

Be it known that I, -FREDERICK EDMUND BERRY, a subject of the King of Great Britain and Ireland, residin at Hayes, in the county of Middlesex, En land, have invented Improvements in orgtelating to Electric Transformer Arrangements, of which the following is a specification.

This invention relates to electric transformer arrangements of the kind in'which there are combined with a main transformer, an auxiliary, transformer of considerably smaller capacity and a supp-lementary winding inductively associated with the main transformer and adapted to directly influence one of the windin of the auxiliar transformer, so that, with the aid of switc ing means, the influence of the supplementary winding upon the main transformer can be varied to secure Volta regulation. This regulation hitherto has been obtained by causing the switching means to include a greater or smaller active length of the supplementary winding in circuit with one of the windings of the auxiliary transformer arrangement. Whilst therefore there is no need to tap either the primary or the secondary windings of the main or auxiliary transformer, it is necessary to tap the supplementary winding.

Now inorder to avoid the necessity of tapping the said spplement-ary winding, it is arranged, accordlng to the present invention, that one of the-windings of the auxiliary transformer (hereinafter called fordistinction the voltage regulating winding) shall be connected to the supplementary winding through a tertiary transformer arrangement under the control of suitable regulating switch mechanism.

In the accompanying illustrative drawings Figs. 1, 2, 3 and 4 illustrate diagrammatically, four ways of carrying out the invention.

According to the arrangement shown in.

Fig. 1 where A represents the main transformer, B the auxiliary transformer, and a the supplementary winding, the ends of the latter winding are permanently connected to the extremities of a single winding 6 provided with a number of tappings a leadlng to contacts 0- d can work in order to connect one end, say the end e, of the voltage regulating winding 6 of the auxiliary transformer to I the primary winding reversed.

over which a switch arm Serial No. 488,704.

any point in or intermediate of the length of the said single winding 6, opposlte end e of the regulating winding 0 being connected toone end of the single winding b; A second or reversing switch f may be employed, so that the said opposite end e of the regulating'winding e can be connected to either end of the said single winding 6 at will. The whole arrangement is such that the single winding 6 constitutes an auto-transformer that can be rendered ineffective upon the supplementary winding a inductively associated with transformer or it can connect the said winding a in contact with the regulating winding e of the auxiliary transformer in various ways the other or I In the arrangement shown in Fig. 2, the

supplementary winding 0 is connected to .g of a small transformer (l the secondary winding h of which is provided with tappings 0' leading to contacts over which the contact arm d of switch mechanism of the kind referred to in connection with Fig. that the voltage regulating winding (2 of the small auxiliary transformer B can be included in circuit with any desired length of the said secondary winding hof the third transformer C, or the connection thereto This arrangement is specially suitable for use in cases where very high voltages are being employed since the supplementary winding a maybe designed for any suitable or convenient low voltage, and all switch and regulating gear may also bev arran d to be suitable for such low voltage of the I supplementary winding. I

appropriate design, the

In addition, by supplementary winding a may be correctly inductively arranged with the whole of the ,main windings of the main transformer A and as there are no tappings on this su plementary winding this condition will he (1 good under all conditions of load, a feature that is not obtained if the regulating is obtained by. means of tappings on the supplementary winding, since with such connections under certain conditions of boost, part of the supplementary winding may not be actively employed.

connected in serieswith the secondary wind- 1, can be moved so- In each case, the second winding 6 of the y ing 7' of the main transformer A as shown in Figs. 1 and 2, or in series with the primary winding 70 of the said transformer as shown respectively in Figs. 3 and 1.

The invention can be applied in connection with polyphase main transformer systems as well as to single phase transformer systems.

What I claim is 2- 1. A transformer arrangement comprising a main transformer, an auxiliary transformer one of the windings of which is connected in series with one of the windings of the main transformer whilst its other winding constitutes a voltage regulating winding, a supplementary winding inductively associated with the main transformer, a tertiary transformer connected to the supplementary winding and regulating switch mechanism associated with the tertiary transformer and whereby the efiect of the supplementary winding on the voltage regulating winding can be varied to suit requirement.

2. A transformer arrangement according to claim 1, wherein the tertiary transformer arrangement comprises a winding adapted to be variously connected to the supplementary winding by the regulating switch mechanism.

3. A transformer arrangement according to claim 1, in which the supplementary winding of the main transformer is connected to the primary winding of the tertiary transformer the secondary winding of which is adapted to be variously connected to the volta e regulating winding of the auxiliary trans ormer, substantially as described.

4. A transformer arrangement comprising a main transformer, an auxiliary transformer having one of its windings connected in series with the secondary winding of the main transformer whilst its other winding constitutes a voltage regulating winding, a supplementary winding inductively associated with the main transformer, a tertiary transformer associated with the supplementary winding and regulating switch mechanism whereby the tertiary transformer can be connected in various ways with the voltage regulating winding.

5. A transformer arrangement according to claim 1, wherein the regulating switch mechanism is adapted to increase, decrease or reverse the effect of the supplementary winding on the voltage regulating winding.

6. A transformer arrangement comprising a main transformer, an auxiliary transformer-one of the windings of which is connected in series with one of the windings of the main transformer and the other winding of which serves as a voltage regulating winding, a supplementary winding inductively associated with the main transformer, a tertiary transformer connected to the supplementary winding, and switch mechanism and electrical connections between the tertiary transformer and voltage regulating winding whereby the latter winding can be connected to various parts of the tertiary transformer and whereby the connections between these parts can be reversed as desired.

7. A transformer arrangement comprising a main transformer, an auxiliary transforme'r of smaller capacity than the main transformerand one of the windings of which serves as a voltage regulating winding, a supplementary windin inductively associated with the main transformer, a tertiary transformer arrangement comprising primary and secondary windings, the primary winding of such tertiary transformer being connected in series with the supplementary winding, and switch mechanism and electrical connections whereby the secondary winding of the tertiary transformer can be variously connected to the ends of the said voltage regulating \vindin and the connections reversed when desire Signed at London, England, this 20th day of December, 1920.

FREDERICK EDMUND BERRY. 

